Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['5109', 'r', 'd', '3251', 'T', '9737', '4383']

5109, 18, 4, 3251, 20, 9737, 4383